1: 890 mg / 47 percent HBr / acetic acid / 0 - 20 °C 2: CH2Cl2 / 3 h / 70 °C 3: aq. NaOH / 0 - 20 °C 4: 503 mg / aq. H2SO4 / 1.5 h / 20 °C 5: 87 percent / aq. HCl / H2O; dioxane / 2 h / 80 °C View Scheme

hydrogen bromide in acetic acid T=0 - 20°C;